3. Can you confirm that the Exchange servers at DR will be synchronized and it will run automatically when the servers at DC server is down? Somehow I found that the exchange at DR may be in different subnet mask already if I am not mistaken.

4. For NLB feature of windows, do we need to do cluster hosts at OS level first or not?

5. To enable NLB, do we need to have two separate network adapter or just two different ports?

6. If client is operating with Windows 2008 standard, can we enable NLB feature for Exchange CAS Array?

1. There is no diagram, please post it.
2. There is no diagram, please post it.
3. There is no diagram, please post it.
4. OS level clustering
5. two seperate adapters
6. No, Server 2008 r2 Enterprise is required for as you will need Windows Clustering and it only comes with Enterprise or above

With your scenario, you will need to split the roles if you will rely on WCS to handle load balancing for your DAG and CAS as those two roles require WCS.

You will have at least two CAS in your array and two DAG members in your array.

Where is your witness server?
I see you have a physical server at the DR but only one NIC, you cannot use that with DAG without a secondary NIC.
I assume the EQL is just for backup replication, no VMWare servers at DR for SRM.

Let's go through your questions:
1. Yes you can do DAG with WCS @ DR site
2. Yes, you can since it's a single server (no CAS Array @ DR Site)
3. It will run, however you will need a witness server @ DR Site as the DAG will lose quorum and fail due to too many partners offline.

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